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have to
01
used to indicate an obligation or to emphasize the necessity of something happening
Transitive
Example
I have to finish this report by the end of the day.
We have to pay our bills before the due date to avoid late fees.
We have to be at the airport two hours before the flight.
02
to be certain about something happening or being true in a given situation
Example
There has to be a reason for the sudden change in behavior.
It has to be a mistake; I never received that email.
There has to be a solution to this problem; let's keep looking.
